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(544-- 245 million years ago) The Cambrian Period was the period of evolution of life on earth. Many marine metazoans having mineralized exoskeletons thrived in the Cambrian period, including sponges, corals, molluscs, echinoderms, bryozoans, brachiopods and arthropods.
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Animals with shells appeared and solar brightness was 6% less than today.
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The Ordvician is named after a Celtic tribe called the Ordovices, and was a time that life diversified and specialized. The theory of plate tectonics states that the Earth's outermost layer is fragmented into a dozen or more large and small plates that are moving relative to one another
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Reef ecosystems saw new and more varied forms, including the ammonoids and fish. It was also a time when life achieved the critical event of adapting to land
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The Permian Period extends from about 286 to 245 million years ago, and is the last geological period of the Palaeozoic Era. Life on land included a diversity of plants, arthropods, amphibians and reptiles.
